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Plugin gradle in android studio don't work

I want use gradle plugin in android studio.
I added classpath in build.gralde:
classpath "com.google.android.libraries.mapsplatform.secrets-gradle-plugin:secrets-gradle-plugin:2.0.0"
and
id 'com.google.android.libraries.mapsplatform.secrets-gradle-plugin'
I put my map api key in local.properties (MAPS_API_KEY = "mykey") and use it on my manifest:
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="${MAPS_API_KEY}" />
My app run succefully But it's don't work for me.

I didn't see you mention it, but when you specify a variable such as ${MAPS_API_KEY}, a value has to be provided that will be substituted later.
For your case, Google recommends using the "local.properties" file. Add an entry there of:
MAPS_API_KEY = your key value
So that the ${MAPS_API_KEY} can be populated with your actual key.

AndroidManifest: resource integer/google_play_services_version not found

I have an android Studio (3.2.1) app, with base module and instantApp feature, Target API is 28. Since when I added Firebase, I started having this maniferst merge error in the title, which I solved adding:
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
In the base app manifest, as mentioned in many answers on this topic.
App runs OK and firebase stuff works, but integration tests (and instant app) are broken with error:
resource integer/google_play_services_version (aka it.future.futureandroid.app:integer/google_play_services_version) not found.
Please notice that I added apply plugin: 'com.google.gms.google-services' in the base app gradle as well, while cloud messaging dependency is only specified inside feature module with:
implementation 'com.google.firebase:firebase-messaging:17.3.4'
while at project-level build.gradle i added:
classpath 'com.google.gms:google-services:4.2.0'
I already tried adding configurations.all as reported in similar questions with no luck. It seems that manifest merger, only with instantApp and integration tests, cannot resolve that integer/google_play_services_version

Problems adding Firebase Crashlytics to Android project - Crashlytics found an invalid API key: null

I am trying to add Firebase crashlytics to our project but just can not get it to work.
I have followed the instructions adding the necessary lines to our gradle file but no success so far.
The main issue I get is this message:
Crashlytics found an invalid API key: null
which seems weird since I thought an API key should not be needed for Firebase.
I use Android studio 3.0.1 with the latest gradle plugin. My project is Ionic based but I have tried to hand modify the gradle file as well with the same results.

I had a similar problem and it turned out that I did not apply google-services plugin in the bottom of build.gradle (in app module)
apply plugin: 'com.google.gms.google-services'
After that it is working

There is an incompatibility with some other Firebase libraries that add the API key in the manifest for you, for example com.firebaseui:firebase-ui-auth:2.3.0
You can check with the Merged Manifest in Android Studio, to see if that is the case:
The issue might be resolve by updating/removing the library if possible, otherwise you can remove the API key by adding a <meta-data> tag with a tools:node="remove" attribute, like this:
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="your.package">
<application
...>
<meta-data
android:name="io.fabric.ApiKey"
tools:node="remove"/>
</application>
</manifest>
This will tell the manifest merger that you don't want this specific meta-data.

# Fabric properties file: app/fabric.properties
apiSecret=x8x6x5x54x4xx8xxxx98 #your api hash
apiKey=xx389xxx8xx7x787x8x7x78x78x9x #api key
if you added api key in manifest remove it

IONIC: unable to build app after installing `cordova-plugin-fcm`

I am new with ionic framework.Currently i am working on ionicsidemenu android app. I want notification in my app for this i have installed cordova-plugin-fcm plugin. After installing plugin when i run ionic run android it gives build failed message with below error
I have configured my app in firebase console. I have plugins in my app :
Please help me.

Your platforms/android/project.properties should be changed like this:
target=android-25
android.library.reference.1=CordovaLib
cordova.gradle.include.1=cordova-plugin-crosswalk-webview/courseur-xwalk.gradle
cordova.gradle.include.2=cordova-plugin-firebase/courseur-build.gradle
cordova.system.library.1=com.google.firebase:firebase-core:+
cordova.system.library.2=com.google.firebase:firebase-messaging:+
cordova.system.library.3=com.google.firebase:firebase-crash:+
cordova.system.library.4=com.google.firebase:firebase-config:+
cordova.system.library.5=com.google.firebase:firebase-core:9.0.0
cordova.system.library.6=com.google.firebase:firebase-messaging:9.0.0
cordova.system.library.7=com.android.support:support-v4:+
cordova.system.library.8=com.google.android.gms:play-services-analytics:+

Make sure you have the The Google Play Services SDK installed.
On my MAC, I use Android Studio -> Configure (at the bottom) -> SDK Manager.

Step 1 (for FCM Plugin)
Comment out these lines in the FCMPlugin.gradle file.
classpath 'com.google.gms:google-services:3.0.0'
apply plugin: com.google.gms.googleservices.GoogleServicesPlugin
Step 2 (for FCM Plugin)
Change the plugin.xml of the FCM plugin to use a different version, in my situation 9.8.0.
<framework src="com.google.firebase:firebase-core:9.8.0" />
<framework src="com.google.firebase:firebase-messaging:9.8.0" />
Step 3 (for Background-Geolocation-Plugin)
Change the plugin.xml of the Geolocation plugin to use a different version, in my situation 9.8.0 instead of "+".
<framework src="com.google.android.gms:play-services-location:9.8.0" />
Step 4
Remove and re-add plattform.
Step 5 (build.gradle file of the android platform folder)
Add this line to the classpath section
classpath 'com.google.gms:google-services:3.1.0'
And add this line below the dependencies, nearly at the bottom of the file
apply plugin: 'com.google.gms.google-services'

Crashlytics found an invalid API key - AndroidStudio build

I saw all other questions, but none of accepted answers is working for me.
By following integration steps found here https://dev.twitter.com/twitter-kit/android/integrate I have created crashlytics.properties file in module root. File is filled with apiKey and apiSecret values found in my newly created twitter application.
Error occurr on project build. I am using AndroidStudio 1.0
This is my error:
ERROR - Crashlytics Developer Tools error.
java.lang.IllegalArgumentException: Crashlytics found an invalid API key: REAL_APIKEY_VALUE.
Check the Crashlytics plugin to make sure that the application has been added successfully!
Contact support#fabric.io for assistance.

You just forgot to add one line, in app-level gradle file.
apply plugin: 'com.google.gms.google-services'
this happens because when you are adding firebase:crashlytics, firebase document not have this line. so you need to add it manually. see this is firebase:crashlytics document photo.

This happened to me when I updated Android Studio from 3.2 to 3.3, to fix it I just updated the
classpath 'com.google.gms:google-services:4.1.0'
to
classpath 'com.google.gms:google-services:4.2.0'
And it worked again

Works fine added this on fabric.properties like this:
# Fabric properties file: app/fabric.properties
apiSecret=xx68f6074dxxxxxc11dxxx97c172e8ebf0
apiKey=xxxe76c4xxxx97e8cxxxx0135e9d46f5a2xxx
Add on .gitignore (for open source projects)
REMOVE entry on AndroidManifest.xml:
<meta-data
android:name="io.fabric.ApiKey"
android:value="xxx6c41xxx6ec601xxxd4xxxa2" />
Oficial documentation: https://docs.fabric.io/android/fabric/settings/working-in-teams.html

I also experienced this issue and it took a while for me to realize I forgot adding the following line into the app/build.gradle:
apply plugin: 'com.google.gms.google-services'
After adding it, it started working like a charm even without <meta-data> in manifest and/or app/fabric.properties file.

Add the below line in app/build.gradle file
apply plugin: 'com.google.gms.google-services'
Clean The Project and Run.

after adding file fabric.properties, getting error as below.
Crashlytics found an invalid API key: null.
Check the Crashlytics plugin to make sure that the application has been
added successfully!
Contact support#fabric.io for assistance.
We need to register app and verify SHA-1 for same.
Add firebase: add google-services.json file from firebase console to your /app folder of your application.(follow steps given by Firebase Console-> Add Firebase to your Android app )
It's not giving error now

<meta-data android:name="com.crashlytics.ApiKey"
android:value="YOUR_API_KEY"/>
Add this one on Android manifest.xml
here you get the api key
https://www.fabric.io/kits/android/crashlytics/install

If someone is using crashlytics with Android dynamic features module, make sure your fabric and google-services plugins are applied only in your app module. In my case that was the problem.

Changing the below dependency at project build.gradle from :
classpath "com.google.gms:google-services:4.1.0"
to
classpath "com.google.gms:google-services:4.2.0"
has solved the problem for me.